From 1b9642ce30d12e492bd859b6a52b80411c51be04 Mon Sep 17 00:00:00 2001
From: CNLohr <lohr85@gmail.com>
Date: Sun, 28 May 2023 05:34:06 -0400
Subject: [PATCH] Revert "Add I2C slave library & example"
---
examples/i2c_slave/Makefile | 9 --
examples/i2c_slave/README.md | 9 --
examples/i2c_slave/i2c_slave.h | 150 -------------------------
examples/i2c_slave/i2c_slave_example.c | 30 -----
4 files changed, 198 deletions(-)
delete mode 100644 examples/i2c_slave/Makefile
delete mode 100644 examples/i2c_slave/README.md
delete mode 100644 examples/i2c_slave/i2c_slave.h
delete mode 100644 examples/i2c_slave/i2c_slave_example.c
diff --git a/examples/i2c_slave/Makefile b/examples/i2c_slave/Makefile
deleted file mode 100644
index a87f07c..0000000
--- a/examples/i2c_slave/Makefile
+++ /dev/null
@@ -1,9 +0,0 @@
-all : flash
-
-TARGET:=i2c_slave_example
-
-include ../../ch32v003fun/ch32v003fun.mk
-
-flash : cv_flash
-clean : cv_clean
-
diff --git a/examples/i2c_slave/README.md b/examples/i2c_slave/README.md
deleted file mode 100644
index cfdbd1b..0000000
--- a/examples/i2c_slave/README.md
+++ /dev/null
@@ -1,9 +0,0 @@
-# I2C peripheral in slave mode
-
-This library and example show how to use the I2C peripheral in slave mode.
-
-The library uses a one-byte address, allowing for up to 256 registers to be defined.
-
-The first byte written to the device within a transaction determines the offset for following reads and writes, emulating a simple EEPROM.
-
-The example will turn on a LED connected to PD0 when the LSB of register 0 is set to 1 and off when it's set to 0.
diff --git a/examples/i2c_slave/i2c_slave.h b/examples/i2c_slave/i2c_slave.h
deleted file mode 100644
index a488eaf..0000000
--- a/examples/i2c_slave/i2c_slave.h
+++ /dev/null
@@ -1,150 +0,0 @@
-/*
- * Single-File-Header for using the I2C peripheral in slave mode
- *
- * MIT License
- *
- * Copyright (c) 2023 Renze Nicolai
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-#ifndef __I2C_SLAVE_H
-#define __I2C_SLAVE_H
-
-#include <stdint.h>
-
-#define APB_CLOCK SYSTEM_CORE_CLOCK
-
-struct _i2c_slave_state {
- uint8_t first_write;
- uint8_t offset;
- uint8_t position;
- volatile uint8_t* volatile registers;
- uint8_t size;
-} i2c_slave_state;
-
-void SetupI2CSlave(uint8_t address, volatile uint8_t* registers, uint8_t size) {
- i2c_slave_state.first_write = 1;
- i2c_slave_state.offset = 0;
- i2c_slave_state.position = 0;
- i2c_slave_state.registers = registers;
- i2c_slave_state.size = size;
-
- // Enable GPIOC and I2C
- RCC->APB2PCENR |= RCC_APB2Periph_GPIOC;
- RCC->APB1PCENR |= RCC_APB1Periph_I2C1;
-
- // PC1 is SDA, 10MHz Output, alt func, open-drain
- GPIOC->CFGLR &= ~(0xf<<(4*1));
- GPIOC->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_OD_AF)<<(4*1);
-
- // PC2 is SCL, 10MHz Output, alt func, open-drain
- GPIOC->CFGLR &= ~(0xf<<(4*2));
- GPIOC->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_OD_AF)<<(4*2);
-
- // Reset I2C1 to init all regs
- RCC->APB1PRSTR |= RCC_APB1Periph_I2C1;
- RCC->APB1PRSTR &= ~RCC_APB1Periph_I2C1;
-
- I2C1->CTLR1 |= I2C_CTLR1_SWRST;
- I2C1->CTLR1 &= ~I2C_CTLR1_SWRST;
-
- // Set module clock frequency
- uint32_t prerate = 2000000; // I2C Logic clock rate, must be higher than the bus clock rate
- I2C1->CTLR2 |= (APB_CLOCK/prerate) & I2C_CTLR2_FREQ;
-
- // Enable interrupts
- I2C1->CTLR2 |= I2C_CTLR2_ITBUFEN;
- I2C1->CTLR2 |= I2C_CTLR2_ITEVTEN; // Event interrupt
- I2C1->CTLR2 |= I2C_CTLR2_ITERREN; // Error interrupt
-
- NVIC_EnableIRQ(I2C1_EV_IRQn); // Event interrupt
- NVIC_SetPriority(I2C1_EV_IRQn, 2 << 4);
- NVIC_EnableIRQ(I2C1_ER_IRQn); // Error interrupt
-
- // Set clock configuration
- uint32_t clockrate = 1000000; // I2C Bus clock rate, must be lower than the logic clock rate
- I2C1->CKCFGR = ((APB_CLOCK/(3*clockrate))&I2C_CKCFGR_CCR) | I2C_CKCFGR_FS; // Fast mode 33% duty cycle
- //I2C1->CKCFGR = ((APB_CLOCK/(25*clockrate))&I2C_CKCFGR_CCR) | I2C_CKCFGR_DUTY | I2C_CKCFGR_FS; // Fast mode 36% duty cycle
- //I2C1->CKCFGR = (APB_CLOCK/(2*clockrate))&I2C_CKCFGR_CCR; // Standard mode good to 100kHz
-
- // Set I2C address
- I2C1->OADDR1 = address << 1;
-
- // Enable I2C
- I2C1->CTLR1 |= I2C_CTLR1_PE;
-
- // Acknowledge the first address match event when it happens
- I2C1->CTLR1 |= I2C_CTLR1_ACK;
-}
-
-void I2C1_EV_IRQHandler(void) __attribute__((interrupt));
-void I2C1_EV_IRQHandler(void) {
- uint16_t STAR1, STAR2 __attribute__((unused));
- STAR1 = I2C1->STAR1;
- STAR2 = I2C1->STAR2;
-
- I2C1->CTLR1 |= I2C_CTLR1_ACK;
-
- if (STAR1 & I2C_STAR1_ADDR) { // Start event
- i2c_slave_state.first_write = 1; // Next write will be the offset
- i2c_slave_state.position = i2c_slave_state.offset; // Reset position
- }
-
- if (STAR1 & I2C_STAR1_RXNE) { // Write event
- if (i2c_slave_state.first_write) { // First byte written, set the offset
- i2c_slave_state.offset = I2C1->DATAR;
- i2c_slave_state.position = i2c_slave_state.offset;
- i2c_slave_state.first_write = 0;
- } else { // Normal register write
- if (i2c_slave_state.position < i2c_slave_state.size) {
- i2c_slave_state.registers[i2c_slave_state.position] = I2C1->DATAR;
- i2c_slave_state.position++;
- }
- }
- }
-
- if (STAR1 & I2C_STAR1_TXE) { // Read event
- if (i2c_slave_state.position < i2c_slave_state.size) {
- I2C1->DATAR = i2c_slave_state.registers[i2c_slave_state.position];
- i2c_slave_state.position++;
- } else {
- I2C1->DATAR = 0x00;
- }
- }
-}
-
-void I2C1_ER_IRQHandler(void) __attribute__((interrupt));
-void I2C1_ER_IRQHandler(void) {
- uint16_t STAR1 = I2C1->STAR1;
-
- if (STAR1 & I2C_STAR1_BERR) { // Bus error
- I2C1->STAR1 &= ~(I2C_STAR1_BERR); // Clear error
- }
-
- if (STAR1 & I2C_STAR1_ARLO) { // Arbitration lost error
- I2C1->STAR1 &= ~(I2C_STAR1_ARLO); // Clear error
- }
-
- if (STAR1 & I2C_STAR1_AF) { // Acknowledge failure
- I2C1->STAR1 &= ~(I2C_STAR1_AF); // Clear error
- }
-}
-
-#endif
diff --git a/examples/i2c_slave/i2c_slave_example.c b/examples/i2c_slave/i2c_slave_example.c
deleted file mode 100644
index dbfaf80..0000000
--- a/examples/i2c_slave/i2c_slave_example.c
+++ /dev/null
@@ -1,30 +0,0 @@
-#define SYSTEM_CORE_CLOCK 48000000
-
-#include "ch32v003fun.h"
-#include "i2c_slave.h"
-#include <stdio.h>
-
-// The I2C slave library uses a one byte address so you can extend the size of this array up to 256 registers
-// note that the register set is modified by interrupts, to prevent the compiler from accidently optimizing stuff
-// away make sure to declare the register array volatile
-
-volatile uint8_t i2c_registers[32] = {0x00};
-
-int main() {
- SystemInit48HSI();
- SetupDebugPrintf();
- SetupI2CSlave(0x9, i2c_registers, sizeof(i2c_registers));
-
- // Enable GPIOD and set pin 0 to output
- RCC->APB2PCENR |= RCC_APB2Periph_GPIOD;
- GPIOD->CFGLR &= ~(0xf<<(4*0));
- GPIOD->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP)<<(4*0);
-
- while (1) {
- if (i2c_registers[0] & 1) { // Turn on LED (PD0) if bit 1 of register 0 is set
- GPIOD-> BSHR |= 1 << 16;
- } else {
- GPIOD-> BSHR |= 1;
- }
- }
-}
--
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